Constrain Draggable

The draggable object can only be moved within its parent container.

示例：

代码：

					
<div class="easyui-panel" style="position:relative;overflow:hidden;width:500px;height:300px">
	<div class="easyui-draggable" data-options="onDrag:onDrag" style="width:100px;height:100px;background:#fafafa;border:1px solid #ccc;">
	</div>
</div>
<script>
		function onDrag(e){
			var d = e.data;
			if (d.left < 0){d.left = 0}
			if (d.top < 0){d.top = 0}
			if (d.left + $(d.target).outerWidth() > $(d.parent).width()){
				d.left = $(d.parent).width() - $(d.target).outerWidth();
			}
			if (d.top + $(d.target).outerHeight() > $(d.parent).height()){
				d.top = $(d.parent).height() - $(d.target).outerHeight();
			}
		}
</script>